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Letters Patent No. 727,825, flared December 31, 1867.

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'IO ALL WHOM IT MAY CONCERN:

Bc it known that we, WILLIAM A. EiinsnnAN and Bonner W.' GRAY, ofPittsburg, in the county of Allegheny, and State ot' Pennsylvania, haveinvented a new and useful Improvement in Apparatus for Carbonizing Coal-Gus for illuminating purposes; and we do hereby declare the following tobe a full, clear, and exact description ofthe same, reference being hadto the accompanying drawings, making apart ofthis specification, inwhich- Figure'l represents a vertical section through the apparatus.

Figure 2, a horizontal section ofthe same.

Figures 3, 4, and 5, views of the burner used in connection with theapparatus.

Similar letters ot' reference, where' they occur in the separatefigures, denote like parts.

Our invention consists in intcrposing between the gas-receiving chamberand the carbonizing-chamber, a valve, which is regulated from theexterior of the apparatus, so as to regulate the inflow of gaspositively by that which is burned, in connection with an improvedburner, hereafter more particularly described, by which means weeconomze much in expense, and produce a 'far better light than isusually obtained by any known process now innse.

To enable others skilled in the art to malte and use our invention,wexvill proceed to describe the same with reference to the drawings. v

A represents an external case, of any suitable form, having tight headsB therein. The interior of this vessel or apparatus `is divided into'two chambers, viz, a larger one, D, and a smaller one, E, by means of aclosed diaphragm, F, so that the onlycommunication between-the twochambers shall be by an opening covered by a button-valve, a, thatisoperated by a shaft, b, and a set-screw,'c, on the exterior; the shaftb, to which the screw c is attached, extending through the upper h'eadB, so as to beoperated from the outside of the case. The under chamber Dis divided into two circumferential chambers, D D, the latter notextending clear around the interior, but leaving a space where there is:Ji-perforated Wall or plate, d, through which gas may freely pass intothe chamber D, saidchamber being filled to a. greater or less extentwith finely-carded Wool that will absorbl the. hydrocarbons, or mixtureoi" hydrocarbons, bythe vapor of which the coal-gas is to be saturated.

-The coal-gas passing through the perforated diaphragm d, passes aroundthrough and in contact with this saturated nely-carded wool, and clearthrough the chamber D, at the farther end of which there is a perforatedYtube or pipe, G, into vvhich the gas passes, and from thence taken tothe burner. The gas enters through a pipe or tube, H, passes into thechamber E, thence through the valve-,covered opening, thence into thechamber D', and thence through the finely-'carded wool in the chamber D,in the lower part of which is placed the carbonizing-ud, thence into thetube G and to the burner. The fluid usedV may ll one-third or more ofthe under chamber D, and its subdivision. chamber D. The upper chamber Eis a closed chamber, separated from the lower, or chamber D, by adiaphragm, F, having an opening in said diaphragm for the passage of theshaft 6. The outlet-pipe G passes through this chamber to thc diaphragmF, made perfectly tight from its insertion in Athe diaphragm down to thcbottom. This outlet-'pipe G is made foraminous in order toreceive thegas afterits passage throughthe finely-carded wool and l'uid in D. Thepipe I is al closed tube through which the fluid is poured into thechamber D and its subdivisions, by means ofthe opening in the side of'the chamber', at or near the bottom thereof.r J is a set-screw, insertedin the side of case A, exteriorly, just below the diaphragm, and nearthepipe I, and is used as a duid-line, to denote when the supply of Huidis suilicient. a is a button-valve, situated on the lower side ofdiaphragm, connected by a shaft passing through the diaphragm and upper-` chamber,

Ion the outside of which is placed a set-screw, 0.1 The operation ofthis set-scrcw c is such that, taken in connection with the burner, usedin combina-tion wth `the whole apparatus, vthe amount of low of gascanalways be accurately xed at the burner, without the usual iiuctuationsexperienced, as greater'or less pressure is used by gas companies,thereby constantly producing a steady light, and at much less expense.

The burner used inconuection with our carburetting-apparatus isrepresented in the drawings by figs. 3, 4, and 5. Fig. 3 is a. view ofthc 4whole burnery ready to apply. Figs. 4 and represent the two partscomposing tbe burner and check, proper.

It will be seen by what has been previously stated, thatv the object ofour button-valve is to fix definitely 'posing fibrous substance.

the amount of ow of gas at the burner, butit is often found necessary toregulate the flame by the use of differentsized burners, so that by theuse of the check-burner, as described in connection with our apparatus,we gain the advantage of a double cheek constantly and uuitedlyregulating the'iame, as the wants of the various consumers may require.These burners and checks we manufacture of iron,fbrass, or any othersuitable material, and may be made of varied sizes or capacities, tosuitthe wants of the public.

I From experience we have discovered that finely rotting purposes, isthe best substance for the purpose. It is more durable than cotton orVany other fibrous Cotton and other vegetable fibres are liable to bekilled by the action 'of gases and the vapors of material.

airing a constant renewal hydrocarbons, besides being liable to becomeclogged up by foreign matters, thus req ofthe substance. Thesedifficulties we obviate entirely 'by the employment of finely-cardedwool as the interention, what we claim as new, and desire to secure byLetters Patent, is

onizing and saving gas for illuminating purposes, constructed asdescribed er and check, in the'manner and for the purpose set forth.

n-valvc a, shaft b, and set-screw c, all con- Having thus described ourinv 1'. An improved apparatus for carb and operated in connection with aburn 2. An upper chamber, E, in combination with the pipe I, buttostrueted and operated as set forth.

3. Theperforated partition oZ, per D D", constructed and operatedsubstantially as described.

4. The Huid-line J. in coniunction with the pipe I and chambers E and'DD D", constructed and operated as set forth. p

5. The employment of nelypose set forth.

forated pipe Gr, in combination with the chamber D and its subdivisionscarded wool as the iuterposing fibrous material, iu the mannerand forthe pur- WM. A. EARSEMAN, ROBERT Wl GRAY.

Witnesses:

T. C. CoNNoLLY, J. R. HAYES.

carded wool asithe fibrous substance to be used for carbu-

